Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264114AbUCZSaO (ORCPT ); Fri, 26 Mar 2004 13:30:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264127AbUCZSaN (ORCPT ); Fri, 26 Mar 2004 13:30:13 -0500 Received: from mtagate2.de.ibm.com ([195.212.29.151]:23186 "EHLO mtagate2.de.ibm.com") by vger.kernel.org with ESMTP id S264114AbUCZSVX (ORCPT ); Fri, 26 Mar 2004 13:21:23 -0500 Date: Fri, 26 Mar 2004 19:21:06 +0100 From: Martin Schwidefsky To: akpm@osdl.org, linux-kernel@vger.kernel.org Subject: [PATCH] s390 (5/7): tape driver. Message-ID: <20040326182106.GF2523@mschwid3.boeblingen.de.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.5.1+cvs20040105i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 15828 Lines: 509 s390 tape driver changes: - Prevent offline while device is in use. - Do not use bus_id string in debug feature messages. - Check for IS_ERR(irb) error conditions in interrupt handler. - Fix removing tape discipline modules. diffstat: drivers/s390/char/tape.h | 5 - drivers/s390/char/tape_34xx.c | 24 ++--- drivers/s390/char/tape_block.c | 7 + drivers/s390/char/tape_core.c | 196 +++++++++++++++++++++++++++++++++-------- drivers/s390/char/tape_std.c | 22 +++- 5 files changed, 198 insertions(+), 56 deletions(-) diff -urN linux-2.6/drivers/s390/char/tape.h linux-2.6-s390/drivers/s390/char/tape.h --- linux-2.6/drivers/s390/char/tape.h Fri Mar 26 18:24:55 2004 +++ linux-2.6-s390/drivers/s390/char/tape.h Fri Mar 26 18:25:58 2004 @@ -198,6 +198,7 @@ /* entry in tape_device_list */ struct list_head node; + int cdev_id; struct ccw_device * cdev; struct tape_class_device * nt; struct tape_class_device * rt; @@ -263,8 +264,8 @@ extern int tape_mtop(struct tape_device *, int, int); extern void tape_state_set(struct tape_device *, enum tape_state); -extern int tape_enable_device(struct tape_device *, struct tape_discipline *); -extern void tape_disable_device(struct tape_device *device); +extern int tape_generic_online(struct tape_device *, struct tape_discipline *); +extern int tape_generic_offline(struct tape_device *device); /* Externals from tape_devmap.c */ extern int tape_generic_probe(struct ccw_device *); diff -urN linux-2.6/drivers/s390/char/tape_34xx.c linux-2.6-s390/drivers/s390/char/tape_34xx.c --- linux-2.6/drivers/s390/char/tape_34xx.c Thu Mar 11 03:55:25 2004 +++ linux-2.6-s390/drivers/s390/char/tape_34xx.c Fri Mar 26 18:25:58 2004 @@ -202,8 +202,7 @@ tape_34xx_delete_sbid_from(device, 0); tape_34xx_schedule_work(device, TO_MSEN); } else { - DBF_EVENT(3, "unsol.irq! dev end: %s\n", - device->cdev->dev.bus_id); + DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id); PRINT_WARN("Unsolicited IRQ (Device End) caught.\n"); tape_dump_sense(device, NULL, irb); } @@ -1314,17 +1313,18 @@ }; static int -tape_34xx_enable(struct ccw_device *cdev) +tape_34xx_online(struct ccw_device *cdev) { - return tape_enable_device(cdev->dev.driver_data, - &tape_discipline_34xx); + return tape_generic_online( + cdev->dev.driver_data, + &tape_discipline_34xx + ); } static int -tape_34xx_disable(struct ccw_device *cdev) +tape_34xx_offline(struct ccw_device *cdev) { - tape_disable_device(cdev->dev.driver_data); - return 0; + return tape_generic_offline(cdev->dev.driver_data); } static struct ccw_driver tape_34xx_driver = { @@ -1333,8 +1333,8 @@ .ids = tape_34xx_ids, .probe = tape_generic_probe, .remove = tape_generic_remove, - .set_online = tape_34xx_enable, - .set_offline = tape_34xx_disable, + .set_online = tape_34xx_online, + .set_offline = tape_34xx_offline, }; static int @@ -1342,7 +1342,7 @@ { int rc; - DBF_EVENT(3, "34xx init: $Revision: 1.18 $\n"); + DBF_EVENT(3, "34xx init: $Revision: 1.19 $\n"); /* Register driver for 3480/3490 tapes. */ rc = ccw_driver_register(&tape_34xx_driver); if (rc) @@ -1361,7 +1361,7 @@ MODULE_DEVICE_TABLE(ccw, tape_34xx_ids); MODULE_AUTHOR("(C) 2001-2002 IBM Deutschland Entwicklung GmbH"); MODULE_DESCRIPTION("Linux on zSeries channel attached 3480 tape " - "device driver ($Revision: 1.18 $)"); + "device driver ($Revision: 1.19 $)"); MODULE_LICENSE("GPL"); module_init(tape_34xx_init); diff -urN linux-2.6/drivers/s390/char/tape_block.c linux-2.6-s390/drivers/s390/char/tape_block.c --- linux-2.6/drivers/s390/char/tape_block.c Thu Mar 11 03:55:37 2004 +++ linux-2.6-s390/drivers/s390/char/tape_block.c Fri Mar 26 18:25:58 2004 @@ -274,12 +274,19 @@ flush_scheduled_work(); device->blk_data.requeue_task.data = tape_put_device(device); + if (!device->blk_data.disk) { + PRINT_ERR("(%s): No gendisk to clean up!\n", + device->cdev->dev.bus_id); + goto cleanup_queue; + } + del_gendisk(device->blk_data.disk); device->blk_data.disk->private_data = tape_put_device(device->blk_data.disk->private_data); put_disk(device->blk_data.disk); device->blk_data.disk = NULL; +cleanup_queue: device->blk_data.request_queue->queuedata = tape_put_device(device); blk_cleanup_queue(device->blk_data.request_queue); diff -urN linux-2.6/drivers/s390/char/tape_core.c linux-2.6-s390/drivers/s390/char/tape_core.c --- linux-2.6/drivers/s390/char/tape_core.c Thu Mar 11 03:55:24 2004 +++ linux-2.6-s390/drivers/s390/char/tape_core.c Fri Mar 26 18:25:58 2004 @@ -69,6 +69,34 @@ [TO_UNASSIGN] = "UAS" }; +static inline int +busid_to_int(char *bus_id) +{ + int dec; + int d; + char * s; + + for(s = bus_id, d = 0; *s != '\0' && *s != '.'; s++) + d = (d * 10) + (*s - '0'); + dec = d; + for(s++, d = 0; *s != '\0' && *s != '.'; s++) + d = (d * 10) + (*s - '0'); + dec = (dec << 8) + d; + + for(s++; *s != '\0'; s++) { + if (*s >= '0' && *s <= '9') { + d = *s - '0'; + } else if (*s >= 'a' && *s <= 'f') { + d = *s - 'a' + 10; + } else { + d = *s - 'A' + 10; + } + dec = (dec << 4) + d; + } + + return dec; +} + /* * Some channel attached tape specific attributes. * @@ -296,10 +324,15 @@ } /* - * Enable tape device + * Set a device online. + * + * This function is called by the common I/O layer to move a device from the + * detected but offline into the online state. + * If we return an error (RC < 0) the device remains in the offline state. This + * can happen if the device is assigned somewhere else, for example. */ int -tape_enable_device(struct tape_device *device, +tape_generic_online(struct tape_device *device, struct tape_discipline *discipline) { int rc; @@ -328,6 +361,9 @@ goto out_char; tape_state_set(device, TS_UNUSED); + + DBF_LH(3, "(%08x): Drive set online\n", device->cdev_id); + return 0; out_char: @@ -342,37 +378,49 @@ } /* - * Disable tape device. Check if there is a running request and - * terminate it. Post all queued requests with -EIO. + * Set device offline. + * + * Called by the common I/O layer if the drive should set offline on user + * request. We may prevent this by returning an error. + * Manual offline is only allowed while the drive is not in use. */ -void -tape_disable_device(struct tape_device *device) +int +tape_generic_offline(struct tape_device *device) { - struct list_head *l, *n; - struct tape_request *request; + if (!device) { + PRINT_ERR("tape_generic_offline: no such device\n"); + return -ENODEV; + } + + DBF_LH(3, "(%08x): tape_generic_offline(%p)\n", + device->cdev_id, device); spin_lock_irq(get_ccwdev_lock(device->cdev)); - /* Post remaining requests with -EIO */ - list_for_each_safe(l, n, &device->req_queue) { - request = list_entry(l, struct tape_request, list); - if (request->status == TAPE_REQUEST_IN_IO) - __tape_halt_io(device, request); - list_del(&request->list); - /* Decrease ref_count for removed request. */ - request->device = tape_put_device(device); - request->rc = -EIO; - if (request->callback != NULL) - request->callback(request, request->callback_data); + switch (device->tape_state) { + case TS_INIT: + case TS_NOT_OPER: + break; + case TS_UNUSED: + tapeblock_cleanup_device(device); + tapechar_cleanup_device(device); + device->discipline->cleanup_device(device); + tape_remove_minor(device); + default: + DBF_EVENT(3, "(%08x): Set offline failed " + "- drive in use.\n", + device->cdev_id); + PRINT_WARN("(%s): Set offline failed " + "- drive in use.\n", + device->cdev->dev.bus_id); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + return -EBUSY; } spin_unlock_irq(get_ccwdev_lock(device->cdev)); - tapeblock_cleanup_device(device); - tapechar_cleanup_device(device); - device->discipline->cleanup_device(device); - tape_remove_minor(device); - tape_med_state_set(device, MS_UNKNOWN); - device->tape_state = TS_INIT; + + DBF_LH(3, "(%08x): Drive set offline.\n", device->cdev_id); + return 0; } /* @@ -479,14 +527,14 @@ tape_generic_probe(struct ccw_device *cdev) { struct tape_device *device; - char *bus_id = cdev->dev.bus_id; device = tape_alloc_device(); if (IS_ERR(device)) return -ENODEV; - PRINT_INFO("tape device %s found\n", bus_id); + PRINT_INFO("tape device %s found\n", cdev->dev.bus_id); cdev->dev.driver_data = device; device->cdev = cdev; + device->cdev_id = busid_to_int(cdev->dev.bus_id); cdev->handler = __tape_do_irq; ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); @@ -497,15 +545,58 @@ /* * Driverfs tape remove function. + * + * This function is called whenever the common I/O layer detects the device + * gone. This can happen at any time and we cannot refuse. */ void tape_generic_remove(struct ccw_device *cdev) { - ccw_device_set_offline(cdev); + struct tape_device * device; + struct tape_request * request; + struct list_head * l, *n; + + device = cdev->dev.driver_data; + DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev); + + /* + * No more requests may be processed. So just post them as i/o errors. + */ + spin_lock_irq(get_ccwdev_lock(device->cdev)); + list_for_each_safe(l, n, &device->req_queue) { + request = list_entry(l, struct tape_request, list); + if (request->status == TAPE_REQUEST_IN_IO) + request->status = TAPE_REQUEST_DONE; + list_del(&request->list); + + /* Decrease ref_count for removed request. */ + request->device = tape_put_device(device); + request->rc = -EIO; + if (request->callback != NULL) + request->callback(request, request->callback_data); + } + + if (device->tape_state != TS_UNUSED && device->tape_state != TS_INIT) { + DBF_EVENT(3, "(%08x): Drive in use vanished!\n", + device->cdev_id); + PRINT_WARN("(%s): Drive in use vanished - expect trouble!\n", + device->cdev->dev.bus_id); + PRINT_WARN("State was %i\n", device->tape_state); + device->tape_state = TS_NOT_OPER; + tapeblock_cleanup_device(device); + tapechar_cleanup_device(device); + device->discipline->cleanup_device(device); + tape_remove_minor(device); + } + device->tape_state = TS_NOT_OPER; + tape_med_state_set(device, MS_UNKNOWN); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + if (cdev->dev.driver_data != NULL) { sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group); cdev->dev.driver_data = tape_put_device(cdev->dev.driver_data); } + } /* @@ -665,7 +756,7 @@ op = "---"; DBF_EVENT(3, "DSTAT : %02x CSTAT: %02x\n", irb->scsw.dstat,irb->scsw.cstat); - DBF_EVENT(3, "DEVICE: %s OP\t: %s\n", device->cdev->dev.bus_id,op); + DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op); sptr = (unsigned int *) irb->ecw; DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]); DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]); @@ -815,7 +906,7 @@ spin_lock_irq(get_ccwdev_lock(device->cdev)); rc = __tape_halt_io(device, request); if (rc == 0) { - DBF_EVENT(3, "IO stopped on %s\n", device->cdev->dev.bus_id); + DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id); rc = -ERESTARTSYS; } spin_unlock_irq(get_ccwdev_lock(device->cdev)); @@ -823,6 +914,24 @@ } /* + * Handle requests that return an i/o error in the irb. + */ +static inline void +tape_handle_killed_request( + struct tape_device *device, + struct tape_request *request) +{ + if(request != NULL) { + /* Set ending status. FIXME: Should the request be retried? */ + request->rc = -EIO; + request->status = TAPE_REQUEST_DONE; + __tape_remove_request(device, request); + } else { + __tape_do_io_list(device); + } +} + +/* * Tape interrupt routine, called from the ccw_device layer */ static void @@ -835,7 +944,7 @@ device = (struct tape_device *) cdev->dev.driver_data; if (device == NULL) { - PRINT_ERR("could not get device structure for bus_id %s " + PRINT_ERR("could not get device structure for %s " "in interrupt\n", cdev->dev.bus_id); return; } @@ -843,6 +952,23 @@ DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request); + /* On special conditions irb is an error pointer */ + if (IS_ERR(irb)) { + switch (PTR_ERR(irb)) { + case -ETIMEDOUT: + PRINT_WARN("(%s): Request timed out\n", + cdev->dev.bus_id); + case -EIO: + tape_handle_killed_request(device, request); + break; + default: + PRINT_ERR("(%s): Unexpected i/o error %li\n", + cdev->dev.bus_id, + PTR_ERR(irb)); + } + return; + } + /* May be an unsolicited irq */ if(request != NULL) request->rescnt = irb->scsw.count; @@ -1023,7 +1149,7 @@ #ifdef DBF_LIKE_HELL debug_set_level(tape_dbf_area, 6); #endif - DBF_EVENT(3, "tape init: ($Revision: 1.44 $)\n"); + DBF_EVENT(3, "tape init: ($Revision: 1.48 $)\n"); tape_proc_init(); tapechar_init (); tapeblock_init (); @@ -1048,7 +1174,7 @@ MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and " "Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)"); MODULE_DESCRIPTION("Linux on zSeries channel attached " - "tape device driver ($Revision: 1.44 $)"); + "tape device driver ($Revision: 1.48 $)"); MODULE_LICENSE("GPL"); module_init(tape_init); @@ -1056,9 +1182,9 @@ EXPORT_SYMBOL(tape_dbf_area); EXPORT_SYMBOL(tape_generic_remove); -EXPORT_SYMBOL(tape_disable_device); EXPORT_SYMBOL(tape_generic_probe); -EXPORT_SYMBOL(tape_enable_device); +EXPORT_SYMBOL(tape_generic_online); +EXPORT_SYMBOL(tape_generic_offline); EXPORT_SYMBOL(tape_put_device); EXPORT_SYMBOL(tape_get_device_reference); EXPORT_SYMBOL(tape_state_verbose); diff -urN linux-2.6/drivers/s390/char/tape_std.c linux-2.6-s390/drivers/s390/char/tape_std.c --- linux-2.6/drivers/s390/char/tape_std.c Thu Mar 11 03:55:20 2004 +++ linux-2.6-s390/drivers/s390/char/tape_std.c Fri Mar 26 18:25:58 2004 @@ -42,8 +42,8 @@ spin_lock_irq(get_ccwdev_lock(device->cdev)); if (request->callback != NULL) { - DBF_EVENT(3, "%s: Assignment timeout. Device busy.\n", - device->cdev->dev.bus_id); + DBF_EVENT(3, "%08x: Assignment timeout. Device busy.\n", + device->cdev_id); PRINT_ERR("%s: Assignment timeout. Device busy.\n", device->cdev->dev.bus_id); ccw_device_clear(device->cdev, (long) request); @@ -84,10 +84,10 @@ if (rc != 0) { PRINT_WARN("%s: assign failed - device might be busy\n", device->cdev->dev.bus_id); - DBF_EVENT(3, "%s: assign failed - device might be busy\n", - device->cdev->dev.bus_id); + DBF_EVENT(3, "%08x: assign failed - device might be busy\n", + device->cdev_id); } else { - DBF_EVENT(3, "%s: Tape assigned\n", device->cdev->dev.bus_id); + DBF_EVENT(3, "%08x: Tape assigned\n", device->cdev_id); } tape_free_request(request); return rc; @@ -102,6 +102,14 @@ int rc; struct tape_request *request; + if (device->tape_state == TS_NOT_OPER) { + DBF_EVENT(3, "(%08x): Can't unassign device\n", + device->cdev_id); + PRINT_WARN("(%s): Can't unassign device - device gone\n", + device->cdev->dev.bus_id); + return -EIO; + } + request = tape_alloc_request(2, 11); if (IS_ERR(request)) return PTR_ERR(request); @@ -111,10 +119,10 @@ tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); if ((rc = tape_do_io(device, request)) != 0) { - DBF_EVENT(3, "%s: Unassign failed\n", device->cdev->dev.bus_id); + DBF_EVENT(3, "%08x: Unassign failed\n", device->cdev_id); PRINT_WARN("%s: Unassign failed\n", device->cdev->dev.bus_id); } else { - DBF_EVENT(3, "%s: Tape unassigned\n", device->cdev->dev.bus_id); + DBF_EVENT(3, "%08x: Tape unassigned\n", device->cdev_id); } tape_free_request(request); return rc; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/